#if !defined(_ADS1115_H_)
#define _ADS1115_H_

#include "sys.h"

/*=========================================================================
    I2C ADDRESS/BITS
    -----------------------------------------------------------------------*/
#define ADS1015_ADDRESS  (0x90) // 1001 000 (ADDR = GND)
                               /*=========================================================================*/

/*=========================================================================
    CONVERSION DELAY (in mS)
    -----------------------------------------------------------------------*/
#define ADS1015_CONVERSIONDELAY (1)
#define ADS1115_CONVERSIONDELAY (8)
/*=========================================================================*/

/*=========================================================================
    POINTER REGISTER
    -----------------------------------------------------------------------*/
#define ADS1015_REG_POINTER_MASK (0x03)
#define ADS1015_REG_POINTER_CONVERT (0x00)
#define ADS1015_REG_POINTER_CONFIG (0x01)
#define ADS1015_REG_POINTER_LOWTHRESH (0x02)
#define ADS1015_REG_POINTER_HITHRESH (0x03)
/*=========================================================================*/

/*=========================================================================
    CONFIG REGISTER
    -----------------------------------------------------------------------*/
#define ADS1015_REG_CONFIG_OS_MASK (0x8000)
#define ADS1015_REG_CONFIG_OS_SINGLE (0x8000)  // Write: Set to start a single-conversion
#define ADS1015_REG_CONFIG_OS_BUSY (0x0000)    // Read: Bit = 0 when conversion is in progress
#define ADS1015_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion

#define ADS1015_REG_CONFIG_MUX_MASK (0x7000)
#define ADS1015_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)
#define ADS1015_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3
#define ADS1015_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3
#define ADS1015_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3
#define ADS1015_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0
#define ADS1015_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1
#define ADS1015_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2
#define ADS1015_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3

#define ADS1015_REG_CONFIG_PGA_MASK (0x0E00)
#define ADS1015_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3
#define ADS1015_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1
#define ADS1015_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2 (default)
#define ADS1015_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4
#define ADS1015_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8
#define ADS1015_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16

#define ADS1015_REG_CONFIG_MODE_MASK (0x0100)
#define ADS1015_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode
#define ADS1015_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)

#define ADS1015_REG_CONFIG_DR_MASK (0x00E0)
#define ADS1015_REG_CONFIG_DR_128SPS (0x0000)  // 128 samples per second
#define ADS1015_REG_CONFIG_DR_250SPS (0x0020)  // 250 samples per second
#define ADS1015_REG_CONFIG_DR_490SPS (0x0040)  // 490 samples per second
#define ADS1015_REG_CONFIG_DR_920SPS (0x0060)  // 920 samples per second
#define ADS1015_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second (default)
#define ADS1015_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second
#define ADS1015_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second

#define ADS1015_REG_CONFIG_CMODE_MASK (0x0010)
#define ADS1015_REG_CONFIG_CMODE_TRAD (0x0000)   // Traditional comparator with hysteresis (default)
#define ADS1015_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator

#define ADS1015_REG_CONFIG_CPOL_MASK (0x0008)
#define ADS1015_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)
#define ADS1015_REG_CONFIG_CPOL_ACTVHI (0x0008)  // ALERT/RDY pin is high when active

#define ADS1015_REG_CONFIG_CLAT_MASK (0x0004)   // Determines if ALERT/RDY pin latches once asserted
#define ADS1015_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)
#define ADS1015_REG_CONFIG_CLAT_LATCH (0x0004)  // Latching comparator

#define ADS1015_REG_CONFIG_CQUE_MASK (0x0003)
#define ADS1015_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions
#define ADS1015_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions
#define ADS1015_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions
#define ADS1015_REG_CONFIG_CQUE_NONE (0x0003)  // Disable the comparator and put ALERT/RDY in high state (default)
/*=========================================================================*/

typedef enum
{
    GAIN_TWOTHIRDS = ADS1015_REG_CONFIG_PGA_6_144V,
    GAIN_ONE = ADS1015_REG_CONFIG_PGA_4_096V,
    GAIN_TWO = ADS1015_REG_CONFIG_PGA_2_048V,
    GAIN_FOUR = ADS1015_REG_CONFIG_PGA_1_024V,
    GAIN_EIGHT = ADS1015_REG_CONFIG_PGA_0_512V,
    GAIN_SIXTEEN = ADS1015_REG_CONFIG_PGA_0_256V
} adsGain_t;


// 不需要初始化，直接调用
// void ADS1115_Init(void);

int ADS1115_Write(uint8_t SlaveAddress, uint8_t address, uint16_t data);
uint16_t ADS1115_Read(uint8_t SlaveAddress, uint8_t address);

uint16_t ADS1115_ReadADCSingleEnded(uint8_t channel);

#endif // _ADS1115_H_
